[Extensions] Remove ExtensionFunction usage of RenderViewHost

extensions/browser/extension_function.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/extension_function.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 500 matching lines @@
 }
 
 bool UIThreadExtensionFunction::OnMessageReceived(const IPC::Message& message) {
   return false;
 }
 
 void UIThreadExtensionFunction::Destruct() const {
   BrowserThread::DeleteOnUIThread::Destruct(this);
 }
 
-content::RenderViewHost*
-UIThreadExtensionFunction::render_view_host_do_not_use() const {
-  return render_frame_host_ ? render_frame_host_->GetRenderViewHost() : nullptr;
-}
-
 void UIThreadExtensionFunction::SetRenderFrameHost(
     content::RenderFrameHost* render_frame_host) {
   // An extension function from Service Worker does not have a RenderFrameHost.
   if (is_from_service_worker_) {
     DCHECK(!render_frame_host);
     return;
   }
 
   DCHECK_NE(render_frame_host_ == nullptr, render_frame_host == nullptr);
   render_frame_host_ = render_frame_host;
@@ skipping 98 matching lines @@
 
 ExtensionFunction::ResponseAction SyncExtensionFunction::Run() {
   return RespondNow(RunSync() ? ArgumentList(std::move(results_))
                               : Error(error_));
 }
 
 // static
 bool SyncExtensionFunction::ValidationFailure(SyncExtensionFunction* function) {
   return false;
 }